Comparison

OPEN EX vs Gantt Chart

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OPEN EX

Features
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OPEN EX ビューワーとは OPEN EXシステムを通して、エクステリア工事の物件情報や様々なファイルを共有できるアプリです。 数が多くて整理の大変な図面や写真ファイルをクラウド上で一元管理することで、ミスやロスを削減しましょう! OPEN EX ビューワーがあれば、アプリからファイルを直接アップロードして共有することができます。 最新の図面や仕様書なども、クラウドでスムーズに最新の内容を共有する事ができます。 PDFや画像ファイルだけでなく、BIMxファイル(パースと図面が完全連動)も簡単に開く事ができ、施行着手までのスピードもUPします。

About

Gantt Chart

Features
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A simple, easy-to-read Gantt chart app for iPhone and iPad. See your project schedule as bars and adjust dates directly with your finger. ■ Pro Schedules for Real Work (Pro, NEW) • Turn your schedule into a PDF to share with clients, managers, or partners, or print it • Start from templates: home renovation, website project, event, moving, and exam prep • Task dependencies: when a task runs long, the tasks after it shift automatically (shown with arrows) • Pro includes everything in Premium. Premium owners can upgrade to Pro at a reduced price ■ Send as a File or Link (Premium) • Send a project as a file or a link by AirDrop, Mail or Messages • Open or paste the link and the project is added in the other person’s app (no server needed) • Save to File exports the project as JSON wherever you like ■ Attach Images (Premium) • Attach images to tasks (up to 10 per project) • See every task’s images together in the Images view • In projects shared via Google Drive, images reach the other person too ■ Now on Mac too • The same app runs on your Mac. If you already own Premium, everything is unlocked there as well ■ Clear Gantt chart • Switch between day, week and month views • Today is marked with a red line; weekends are shaded • Task names and dates stay pinned while you scroll in any direction • Milestones (◆) supported ■ Adjust schedules by touch • Touch and hold a bar and drag to move it by days • Drag either end of a bar to lengthen or shorten it • Tap to edit details ■ Progress and checklists (checklists: Premium) • Completion checkmarks and progress for every task • Add a checklist to a task and let its completion drive progress automatically • Overall project progress is calculated for you ■ Reminders (Premium) • Get notified on the start date, the day before, the end date, the day before the end, or at a custom time • Move the schedule and reminders follow along ■ Share with your team (Premium) • Share and sync projects with others using Google Drive • Edits to different tasks made at the same time are both kept • Each person who shares needs Premium ■ Delay tracking & working days (Premium) • Tasks behind schedule turn red, and overdue tasks stand out • Skip weekends and public holidays (about 250 countries and regions) and count durations in working days • Bars snap to working days when you move them ■ Designed for iPad too • Project list and Gantt chart side by side • Dark Mode supported The free version includes 1 project with up to 5 tasks. Premium (one-time in-app purchase) unlocks unlimited projects and tasks, plus checklists, reminders and sharing. No account needed. Your data stays on your device.

Screenshots

OPEN EX4 screens
Gantt Chart3 screens

Verdict

The call

The clearest difference is in-app purchases: OPEN EX at none against Gantt Chart's 3. OPEN EX also leads on iOS requirement (15.0 vs 18.0). Gantt Chart's advantage is update cadence (every 2 days vs every 5 weeks). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Gantt Chart sells 3 one-off in-app purchases. OPEN EX asks for nothing beyond the download.

UpkeepUpdate frequency

OPEN EX ships an update every 5 weeks, Gantt Chart every 2 days. The most recent releases landed on November 8, 2026 and November 13, 2026 respectively.

Scorecard3 real differences · 3 level
OPEN EX versus Gantt Chart: the parameters behind the verdict, then further details
ParameterOPEN EXGantt Chart
PriceFreeFree
Update frequencyEvery 5 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better18.0
Further details — not scored
Size44 MB4 MB
Age rating4+4+
DeveloperRIK CorporationYOSHIYUKI UEMATSU

In-app purchases

None

OPEN EX

No in-app purchases

3 purchases

Gantt Chart

One-time3
  • Upgrade to Pro$2.99
  • Premium$2.99
  • Pro$4.99

Questions

Is OPEN EX free?
OPEN EX is free to download, with no in-app purchases.
Is Gantt Chart free?
Gantt Chart is free to download, with in-app purchases available.
Do OPEN EX or Gantt Chart have ads?
Neither OPEN EX nor Gantt Chart shows ads.
Which is updated more often, OPEN EX or Gantt Chart?
OPEN EX ships an update every 5 weeks, and Gantt Chart every 2 days. Most recently, OPEN EX was updated on November 8, 2026 and Gantt Chart on November 13, 2026.

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